//
//  StatusCell.swift
//  Weibo10
//
//  Created by 吕昱坪 on 15/12/11.
//  Copyright © 2015年 itcast. All rights reserved.
//

import UIKit

/// 微博 Cell 中控件的间距数值
let StatusCellMargin: CGFloat = 12
/// 微博头像的宽度
let StatusCellIconWidth: CGFloat = 35

//微博cell
class StatusCell: UITableViewCell {
    
/// 微博视图模型
    var viewModle: StatusViewModel? {
        didSet{
            
            topView.viewModle = viewModle
            
             contentLabel.text = viewModle?.status.text
            
            //设置配图视图 - 设置视图模型之后，配图视图有能力计算大小
            pictureView.viewModle = viewModle
            
            pictureView.snp_updateConstraints { (make) -> Void in
            //这里是根据设置的宽高数值去修改约束
                make.height.equalTo(pictureView.bounds.height)
                //直接设置宽度数值
                make.width.equalTo(pictureView.bounds.width)
                
                //根据配图数量，决定配图视图的顶部间距
//    let offset = viewModle?.thumbnailUrls?.count > 0 ? StatusCellMargin : 0
//    make.top.equalTo(contentLabel.snp_bottom).offset(offset)
                
            }
        }
    }
    /// 根据指定的视图模型计算行高
    ///
    /// - parameter vm: 视图模型
    ///
    /// - returns: 返回视图模型对应的行高
    func rowHeight(vm: StatusViewModel) -> CGFloat {
        
        //1.记录视图模型->会调用上面的 didSet 设置内容以及更新 ‘约束‘
        viewModle = vm
        
        //2.强制更新所有约束 -> 所有控件的frame都会被计算正确
        contentView.layoutIfNeeded()
        
        //3.返回底部视图的最大高度
        return CGRectGetMaxY(bottomView.frame)
    }
    
    //MARK:- 构造函数
    override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
        
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        
        setupUI()
        
        selectionStyle = .None
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    
    // MARK: - 懒加载控件
    /// 顶部视图
    private lazy var topView: StatusCellTopView = StatusCellTopView()
    /// 微博正文标签
     lazy var contentLabel: UILabel = UILabel(title: "微博正文",
        fontSize: 15,
        color: UIColor.darkGrayColor(),
        screenInset: StatusCellMargin)
    //配图视图
     lazy var pictureView: StatusPictureView = StatusPictureView()
    /// 底部视图
     lazy var bottomView: StatusCellBottomView = StatusCellBottomView()
}

// MARK: - 设置界面
extension StatusCell {
    
     func setupUI() {
        //1.添加控件
        contentView.addSubview(topView)
        contentView.addSubview(contentLabel)
        contentView.addSubview(pictureView)
        contentView.addSubview(bottomView)

        
        // 2. 自动布局
        // 1> 顶部视图
        topView.snp_makeConstraints { (make) -> Void in
            make.top.equalTo(contentView.snp_top)
            make.left.equalTo(contentView.snp_left)
            make.right.equalTo(contentView.snp_right)
            make.height.equalTo(2 * StatusCellMargin + StatusCellIconWidth)
        }
        
        // 2> 内容标签
        contentLabel.snp_makeConstraints { (make) -> Void in
            make.top.equalTo(topView.snp_bottom).offset(StatusCellMargin)
            make.left.equalTo(contentView.snp_left).offset(StatusCellMargin)
    }
        
        
        //4>底部视图
        bottomView.snp_makeConstraints { (make) -> Void in
            make.top.equalTo(pictureView.snp_bottom).offset(StatusCellMargin)
            make.left.equalTo(contentView.snp_left)
            make.right.equalTo(contentView.snp_right)
            make.height.equalTo(44)
        }
    }
}
























